My ex gilead friend told me when she was diagnosed with PTSD that a fellow missionary comforted her by saying "there are many missionaries taking anti-depressants so there is no shame in needing help. Missionary life is tough."
They are an expensive investment. I'm surprised they took this long to do away with the school. Plus there are still many JW's willing to move where the need is greater so why pay for missionaries when people are still willing to sacrfice for free.